- The musculomembranous partition between the abdominal and thoracic cavities.
- A thin disc pierced with an opening, used in a microscope, camera, or other optic instrument to shut out the marginal rays of light, thus giving a more direct illumination.
- A flexible ring covered with a domed sheet of elastic material used in the vagina to prevent pregnancy.
- In radiography, a grid (2) or a lead sheet with an aperture.
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Examples: glitazone, GI cocktail, etc.